My other cousin who has been reefing for 5 years told me either to have a deep sand bed of 3 1/2-4 inches or barely having 1 at all. Is this true? He said having the thick sand bed helps. He is also bringing me a bag of his sand (3 years old) to help with my startup. When he come down we are turning a 10 gallon I have into refugium, setting up a sump, and getting prtoein skimmer. I want all this hidden underneath the tank, so what all should I start buying for when he arrives so that we can get right on this project?